updates seismogram storage and source time function usage for GPU kernels

[codecov[bot]]

Codecov Report

Patch coverage: 21.35% and project coverage change: -0.04 :warning:

Comparison is base (525daa9) 41.00% compared to head (cb30771) 40.97%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #823 +/- ## ========================================== - Coverage 41.00% 40.97% -0.04% ========================================== Files 263 263 Lines 57743 57835 +92 ========================================== + Hits 23679 23695 +16 - Misses 34064 34140 +76 ``` | [Impacted Files](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM) | Coverage Δ | | |---|---|---| | [src/gpu/specfem3D\_gpu\_method\_stubs.c](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL2dwdS9zcGVjZmVtM0RfZ3B1X21ldGhvZF9zdHVicy5j) | `0.00% <0.00%> (ø)` | | | [src/meshfem3D/fix\_non\_blocking\_flags.f90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL21lc2hmZW0zRC9maXhfbm9uX2Jsb2NraW5nX2ZsYWdzLmY5MA==) | `98.27% <ø> (ø)` | | | [src/meshfem3D/get\_MPI\_1D\_buffers.f90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL21lc2hmZW0zRC9nZXRfTVBJXzFEX2J1ZmZlcnMuZjkw) | `95.40% <ø> (ø)` | | | [src/meshfem3D/meshfem3D\_models.F90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL21lc2hmZW0zRC9tZXNoZmVtM0RfbW9kZWxzLkY5MA==) | `49.80% <ø> (ø)` | | | [src/meshfem3D/write\_AVS\_DX\_global\_faces\_data.f90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL21lc2hmZW0zRC93cml0ZV9BVlNfRFhfZ2xvYmFsX2ZhY2VzX2RhdGEuZjkw) | `0.00% <0.00%> (ø)` | | | [src/meshfem3D/write\_AVS\_DX\_surface\_data.f90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL21lc2hmZW0zRC93cml0ZV9BVlNfRFhfc3VyZmFjZV9kYXRhLmY5MA==) | `0.00% <0.00%> (ø)` | | | [src/shared/parallel.f90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL3NoYXJlZC9wYXJhbGxlbC5mOTA=) | `53.07% <0.00%> (-0.48%)` | :arrow_down: | | [src/specfem3D/compute\_add\_sources.f90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL3NwZWNmZW0zRC9jb21wdXRlX2FkZF9zb3VyY2VzLmY5MA==) | `34.89% <0.00%> (+1.35%)` | :arrow_up: | | [...cfem3D/compute\_forces\_acoustic\_calling\_routine.F90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL3NwZWNmZW0zRC9jb21wdXRlX2ZvcmNlc19hY291c3RpY19jYWxsaW5nX3JvdXRpbmUuRjkw) | `69.23% <ø> (ø)` | | | [src/specfem3D/compute\_seismograms.F90](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL3NwZWNmZW0zRC9jb21wdXRlX3NlaXNtb2dyYW1zLkY5MA==) | `9.23% <0.00%> (ø)` | | | ... and [19 more](https://app.codecov.io/gh/SPECFEM/specfem3d_globe/pull/823?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM) | |

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